Tire spreader



JanQ2l, 1936. w. H. DALRYMPLE TIRE SPREADER Filed Sepb. 25, 1955 Patented Jan. 21, 1936 PATENT OFFICE v 'rims` sPaEADEn AWilliam Henry Dalrymple, Brucefield,

Ontario, Canad September 25', 1,935, Serial No. 42,150

In Canada. May 9, 1935 Application 4 Claims.

My invention relates to improvements in tire spreaders, and the object of the invention is to devise a simple, easily operable and quick device for spreading the annular lips of a tire casing apart simultaneously at all points toallow of the easy insertion of a tube or of the repair of the interior of the casing, and it consists essentially of the arrangement and construction of parts as hereinafter more particularly explained.

Fig. 1 is a perspective view of my spreader and a tire casing applied thereto.

Fig. 2 is a sectional view through the spreader and tire casing.

Fig. 3 is a perspective detail of the engaging portions of the base and centre stem separated apart.

In the drawing like characters of reference indicate corresponding parts in each figure.

I and 2 are crossed members secured together to form a base upon which the spreading mechanism is centrally supported. The members I and 2 are preferably provided with a metal tie plate 3 having a rectangular orifice 4, such orifice being continued down through the crossed portions of the members I and 2.

5 is a centre stem having a squared lower end 5X fitting the orifice 4, a central smooth cylindrical portion 5, and an upper threaded portion 51. 6 and 'I are spreader members substantially of cone frustum shape. The member 6 is provided with an internally threaded centre orifice 6X engaging the threaded portion 5 of the stem 5. The member 'I is provided with an unthreaded centre orifice 1X so as to freely rotate around the stem 5 without longitudinal movement, being held from such longitudinal movement between a collar 'Io welded to the shaft or other means for forming a shoulder eng-aging the upper end of the member l 'l and a pin 11 or other holding means projecting from the shaft directly beneath the member "I,

8 and 9 are collars mounted on the stem 5 to have free longitudinal movement thereon. The upper collar 8 normally rests upon the member 6 and the lower collar 9 on the plate 3. I0 is a tire casing provided with the usual edge lips I0 and I00. II are fingers pivotally mounted upon the collar 8 and depending therefrom so as to rest on the outer peripheral edge 6 of the spreader member 6. The lower extremities of the fingers II are turned up into hook form at IIX suitable for engaging the upper lip III of the tire casing I0. I2 are fingers pivotally mounted on the collar 9 and provided with downturned outer extremities I2 suitable for engaging the lower lip II)0 of the tire casing.

In order to place the tire casing in position for spreading, the collar 8 land the fingers I I carried thereby are raised. The collar 8 is thereby carried away from the member 6 and the iinger extremities II drawn inward towards the stem 5. 5 The casing I0 is then passed vertically downward, to the position shown in the drawing, over the stem 5 so that the finger ends II pass the lip |00 of the tire casing. The collar 8 is then released so that the finger ends IIX are carried outward to engage beneath the lip I0 to support the tire casing.

If the tire casing is of smaller internal diameter, the collars 8 and 9 will not be brought into engagement with the members 6 and I as shown in the drawing when the spreading operation is performed.

The fingers I2 are then swung upward from their dotted position so that their ends I2X pass above the lip IBO. `The collar 9 is then raised to carry the finger ends I2X outward to engage the 'lower lip I0o in they positio-n shown in the drawing. The parts are so adjusted that when placed in the above position the fingers-II and I2 assume the same angular position in relation to the stem 5.

The tire casing I0 is then spun manually in the direction of arrow carrying the fingers I I in the same direction. The fingers II are forced into frictional conta-ct with the outer peripheral edge 6 of the member 6 so that the fingers II, member 6 and collar 8 rotate as one unit. The member 6 is simultaneously carried upward longitudinally of the stem 5 by the threaded portion 51 with which it engages lifting the collar 8 and fingers II in the same direction.

By the upward movement of the member 6 a pull is exerted on the collar 9 and fingers I2 through the tire casing intervening between the fingers II and I2 thereby pulling the casing lips 40 IlI and I0o apart or into the dotted position shown in Fig. 2, thereby providing a wide annular mouth through which an inner tube may be easily inserted or interior repairs made.

As soon as these operations are performed, the tire casing may be released by rotating the tire casing in the opposite direction to arrow.

What I claim as my invention is:-

1. A tire casing spreader comprising means for separately engaging each lip of the tire casing, a r .threaded mounting for rotatably supporting the lip engaging means, and means operated by the thread of the mounting for automatically carrying the lip engaging means and lips apart as the tire is rotated around the mounting. 55

2. A tire casing spreader' comprising a stem. ing the upper lip away from the lower lip cornforming a central mounting and having a threaded portion, upper and lower collars surrounding the stem, a plurality of ngers pivoted to each collar and extending into engagement at their opposite ends with the inner faces of the tire casing lips, means for simultaneously adjusting the upper and lower ngers to their outward spread position into engagement respectively with the upper and lower lips of the casing, and means operated by the rotation of the casing and. coacting with the aforesaid thread for increasing the distance between the upper and lower ngers.

3. A tire casing spreader comprising a stem mounted at one end on a suitable support and having a threaded portion, means on the stem for anchoring the lower lip of the casing from movement parallel with the stem and means for movprising a collar freely surrounding the threaded portion, ngers pivoted to the collar and having hook portions engaging beneath the upper lip of the tire casing, and a member engaging the thread of the stem and forming an annular edge on which the fingers rest.

4. A tire spreader comprising a base, a stud extending upward therefrom, upper and lower co1- lars surrounding the stud, a plurality of arms pivoted to each collar and having lip engaging means at their outer end, means operated by the rotation of the tire around the stud for carrying the collars apart, and conical members on the stud for maintaining the arms in a tire engaging position during the spreading operation.

WILLIAM HENRY DALRYNIPLE. 

